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If a pool turns green after adding salt, there’s a good chance the salt is the problem. Certain brands of salt have high levels of iron that cause pool water to take on a green hue. Test your pool water to determine if this is the issue. The green color will usually filter out. Brush the sides of the pool to knock the iron off.

This is just one reason a pool can turn green that is specific to adding salt. Many other reasons a pool can turn green include algae growth, low chlorine levels, a faulty filter, etc.

Size is the main difference between a pool and a spool. Spools are typically about half the size of an average pool, so they’re ideal for yards without the space for a full-sized pool. Spools are also easier to heat, so they tend to be a higher temperature than pools and can be adjusted to get as hot as a spa when it’s time for a relaxing soak. Spools also contain jets and blowers, while most pools do not.

The formula you’ll use to measure your pool will differ based on the shape of your pool. For a rectangular pool, you’ll use the following formula to find the size in gallons: length x width x depth x 7.5. If the depth changes from one end of your pool to the other, take the average by finding the depth at the deepest and most shallow points and dividing that number by two. Circular and oval pools require different, more complicated formulas, which can be found in this article.

It is possible to restore a filled-in pool. If you want to dig up and repair a filled-in pool in your backyard, the process will cost about the same as the cost of installing a new in-ground pool. You might do this if the filled-in pool is causing sinking, swelling, or drainage issues in your yard. A new pool may resolve these problems and increase your property value.